Moving faces radially
Ensure that the Pivot Point is set to '3D Cursor'.
In edit mode, select the faces you want to move radially.
Hit 'Shift-S', then select 'Cursor to Selected'. The 3D Cursor should now be in the center of your selected faces.
Hit 'S' then 'Shift+Z'. This will scale your faces in X and Y but not Z.
Move your mouse or enter a value from the keyboard and hit enter when the faces have been moved radially to the correct position.